Reamer blade



' PatentedJune 23, 1931 ,Pa-rear ror"Hc-P1@- enemies ,B- realisme -OF' nNVERSITY ma mesetas Assieme so .THE Kennis? f .Gomes-#HOM QF WlLMINGf-UON. @Mairena A .comensales .0F DELAWARE BEAMER BLADE The present improvements relate more par,- ticularly to areainer blade ,of the type adaptedto have removable engagement with a suitable supporting head.

' 5 i The device .of the present invention is .particularly adaptable for 'use With Well- .driillling machinery of they rotary type and ycomprises various essentialffeatures of high utility and obvious advantage.

More specifically the -reamer blade of the present vinvention .comprises a` supporting l body adapted to have cooperative removfable' engagement with a suitable supporting head, fromtwo .sides of Which body portion 115 project reaming or dri-lling surfaces'. One of the 'latter comprises a portion projecting .beyond the side Wallof the head presenting an elongated.reaming edge or edges lying in an axis substantially parallel to the plane ofthe 2O head. From gan adjacent lower edge'of the ysupporting body portion projects'a cutting blade having a cutting surface.

Y Thedevice-.of thepresent' invention may be usedin combination with a drilling bit which -25 forms the subject matter of a co-pending applicltion Serial No.'172,2458, filed March,

192 r i f The use of the reamer blade of the present invention, due to the elongated reaming edge 30 or edges, results in the'v actual drilling of a much'straighter hole and one which is true to gaugel 'The device is characteriaed by its economyin cost of manufacture and the ease ,u with Whichit may be installed in or removed '35 from asu'itable supporting head. Y 1

'In use andoperation, tvv-o or more of these reamer blades 'are rused 'With each head, the reamer blades:V being suitably spaced apart,

' In drillingV practice lit'has been found that by 4 presenting'transversely-spaced reaming surfacesr torf'tli'e formation being drilled that,

` relativeto the speed of rotation, the spaced elongated reaining surfaces function if the y'supper-'ti'ng members drilllat an angle 14.5 When hard formation is suddenly encountered.

i The utility of the invention, the objects thereof andv advantages accruing to its use j Will be more apparent from the following de- 50 scription.

1927'. Serial No. 172,247.

In the drawings, Fig. l is a face elevational view; F ig. 2 is an end elevational View; and 3 is a bottom end view of the reamer blade of thepresent invention; Fig. l is a c IQSs Sectional' View taken on lined-4 of Fig-"2. Y

Referring more particularly vto .the drawings; l designates the sujiporting stock or body portion ofthe reamer blade, which in ,the present'instance'talres substantially the form of an elongated rectangle having upper edge 2, side edges 3 and 4., and lower edge 15.' This supporting body l is constructed of any suitablematerial and may be of cast, forged, or rolled steel. the drawings is full size for drilling an 1l inch hole. lt is to be understood, of course, that changes may be made in the proportions, in thickness, length, or Width without departing from the scope ofthe present-invention. 'This supporting body l is scien` tiically heat-treated to secure themost etlicient results. vThe sides 2 and 3 'are preferably rounded as indicated inthe drawings in order to provide greater and more efficient bearing surfaces when in place in' a suitable supporting head.

Thereamer blade illustrated in the dra-W- ings is adapted to have cooperative removable locking engagement with a suitable form of supporting head. @ne manner in which the reamer bladeper se may have locking engagement with a head may comprise the locking lug 5 which is adapted t0 register vWith a corresponding' longitudinal groove in said supperting head. When the reamer blade is forged, the formation of the locking lug 5 Will result in a recess 6 on its opposite side.` It is obvious, of course, that `any other form of locking arrangement may be provided and I "do 'not Wish to -limit myself to the lug 5 and recess 6'.

The illustration in i Referring now to one of the features of the y present invention, the side l is the one WhichA projects beyond thesides of the head andas indicated clearly in Fig. 4;, thisisprovided with a knifeflike cutting edge 7,wl1ich tapers rearwardly or inwardly to provide clearance and permit relief for said-cutting edge 7 and a similar cutting edge 8, spaced from the V`cutting edge 7 by means of the longitudinal frecess9. It is tobe noted that the knife-like edge 8 lies in a plane rearwardly and inwardly relativeV to the original plane of the edge 7, but in explanation it is to be noted that the edgeV 8'is lin 'the same circular plane.

' `V`The surface projects rearwardly and inwardly rather'sharply frofmthe point 8 as indicated at 10 to provide clearance similary to that permitted for thev cutting edge 7. In

operation it is the elongated reaming side t `which is presented to the formation being .drilled and it assists in the drilling of ay straighter hole by keeping the head true to gauge and properly supported. The advantage ofproviding two or moreV sharp, knifelike edges 7 and 8 on this reaming sid-e surface is that it permits faster reaming, cooling water being permitte'dto 'flow up through thelongitudin'al recess 9 and the sharp, knife- 'like edges will cut more freely andl with less f resistance,than one edge.v

Y Now describinganother'.feature of the present invention, projecting from the base of the supporting'structure 1 is the cut-tingy bladev 11 which in the-present instance tapers n inwardly from thefside 3 of the supporting structure along the line 12 to present a cutting i 'surface 13 of less width than the width of the supportingfstructure 1. rIhe' low-er ledge 5 of the supporting structurel may be formed fon a taper from the rounded side 3' to the side fl as indicated clearly in Fig@ 1. The cutting blade Y .11 .from this point downwardly is decreased in thickness Aboth on its front and rear surfaces asin'dicatedclearly in Fig. 3, thus it is tobe noted that the cutting edge 13 is ofmaterially less` width and thickness than the supporting structure 1 and is ofcourse, of relatively shortlength. Y y

'As heretofore pointed out the reamerblade of thefpresentinvention maybe utilized' as a reamer blade, and at the same time as a V drilling cutter in combination with adrilling bit such as'illustrated in my co-pending apv' plication,Serial Number 172,248, filed March 3,1927. y ,Y kOne advantage of the particular construction of the blade 11 andthe reasons underlying the taperingofthe lower edge 5- may be explained' as follows: 'The material Vremoved in thepdrillingoperation must not b-e permitted to clog up .in vany pockets between the head yand reamer and toffacilitate the passage-.of said material, the lower edge 5 hasV been ytapered as indicated.- This tapering j and thereduction iny thickness of the 'blade fwill .assist in the removal `of any i such material. Y

' By the term supporting structure7 as used inthe specification, I intend to indicate'the y structure designated as 1, which is adapted to Y be substantially wholly mounted within a headl with only a portion ofthe side 4 and the blade 11 vprojecting from* the side and @width than thickness.

baise respectively. By the expression elongated reaming side, I intend to indicate the side 4l. By the expression blade used alone, I inten-d to indicate the drillingfblade 11 projecting from the-base of the support 1. It is to bepointed out that the reamer blade is of greater length thanwidth and Vof greater Il have illustrated the ribs 5 las being `rounded in surfacecontour Yand as having arounded upperedge; The

lower end maybe cut awayinwardlyV relative to the longitudinal plane thereof as indicated vat 14 for the purpose of cooperatively engagingwith the rounded top edge of a drilling bit when the reamer is used in thecombination as heretofore-described.

It is tobe noted that thecutting edge 13 is offs-et at an angle diEerent-from the general vlongitudinal plane of the supporting body 1 lspaced cutting edges, a cutting blade projecting from the lower edge. thereof ofy substan-y tially less width, lengthand thickness. than the supportingbody vand so disposed kas to form an offset shoulder 'onV the entire lower edge-.of said supporting body, and an-inte'gral locking lug projecting from one'face of the supporting body intermediate opposite longitudinal-edges, saidf locking lug lyingin a plane ,substantially parallel to said longitudinal edges'. f f

2. A reamer blade consistingV essentially of a supporting body substantially rectangular Vin configuration, having two adjacent rounded edges, a third edge provided witha plurality oflongitudinal relatively thin/cutting edges,and alower edge' provided with an oE-set shoulder andan integrale-cutting blade having a lower cutting edgeand a side cutting edge formingan uninterrupted-'continuation Yof said third sidel of :the supporting body, the opposite edg'eof'fsaid cutting blade tapering from one side ofthe supporting 'body inwardlyland downwardlyto. provide a.

cutting edge of considerably less Awidth than the supporting body;l

CHARLISLB.I KENNEDYE- 

